Protect an executable

[Επισκέπτης]

Hello guys, exw ena provlima...

 

8elw na prostatepsw ena executable (tou opoiou den exw ton source code). Vasika mesa sto executable se ena offset uparxei ena serial to opoio 8elw na mh mporei na to dei kaneis... dokimasa enan compressor (de 8ymamai name) kai enw den mporousan na doun ton serial me hex editing kapws ton vrhkan pali.... (me search kapou mesa sth mnhmh isws?)

 

Uparxei tropos na prostatepsw to executable etsi wste na mhn fainete auto to serial? Poion compressor-protector 8a mou proteinate?

 

Thanks gia to help

[Lyman_Zerga]

Ψάχνεις για κάποιον exe packer. Google.

 

Φυσικά, ότι κλείνει, ανοίγει.

[Επισκέπτης]

exei kaneis stat upopsin tou kanenan packer/protector pou na mporei na kanei th douleia pou lew parapanw?

 

ty

[Opaque]

Dokimase me to Neolite, enan compressor gia Windows 32-bit exe files. 8a ton breis sto google.

 

Alla egw 8a soy proteina na allakseis ton tropo me ton opoio apo8hkeyeis to serial number sto programma soy. Mporeis dhladh na kryptografhseis to serial number.

Gia paradeigma, an to serial number einai to string "hello", kai to peraseis apo mia kryptografhsh md5 8a soy prokypsei to string "5D41402ABC4B2A76B9719D911017C592". To kalo me thn kryptografhsh md5 einai oti den mporeis na thn antistrepseis. Ara, kai na dei kapoios oti to kryptografhmeno serial poy exeis apo8hkeymeno sto programma einai to "5D41402ABC4B2A76B9719D911017C592", den 8a mporesei na to metatrepsei sto arxiko serial poy htan to "hello".

Ara to mono poy exeis na kaneis einai :

- Kryptografhse to serial poy xrhsimopoieis me md5

- Apo8hkeyse to kryptografhmeno serial sto programma, kai oxi to arxiko

- Ka8e fora poy o xrhsths bazei ena serial gia na kanei register to programma soy, kryptografhse thn eisodo toy xrhsth se md5, kai elegkse an ayto poy prokyptei einai idio me ayto poy exeis apo8hkeymeno.

 

An xrhsimopoihseis ayto poy soy proteinw, bale ena megalo string san serial number (>8 xarakthres), wste akoma kai me brute forcing na mhn ginetai na apokryptografh8ei.

 

Elpizw na egina katanohtos.

Kapoia links poy isws soy xreiastoyn :

 

http://www.faqs.org/rfcs/rfc1321.html (perigrafh toy algori8moy md5)

 

http://www.osix.net/modules/article/?id=42 (algori8mos md5 ylopoihmenos se Java)

[Επισκέπτης]

To provlima einai oti den exw ton source code... Giauto kai psaxnw kapoion protector pou na mporei na "mperdepsei" th mnhmh etsi wste otan o "cracker" psaksei sto offset na mhn vrei auto pou perimenei kai epishs na mhn mporei na to vrei me hex editing

 

Pantws isws na akougete periergo to na 8elw na prostatepsw ena serial pou vriskete se .exe tou opoiou to source den exw alla... uparxei logos

 

Sigoura pantws 8a mou fanoun xrisima auta pou mou eipes Opaque, se euxaristw poly